Ceratopteris thalictroides

C. thalictroides in my aquarium
Branch of C. thalictroides growing out of the water

Common name
Water sprite

Synonymies
Acrostichum thalictroides

Description
Light-green aquatic fern. This plant can be held planted in the aquarium substrate or floating on the water surface. This plant forms a big, thick group where many fish like to hide in.

My experiences
After I bought this plant it toke 1 to 2 weeks before it started to grow a bit. This probably because the plant I bought was cultivated above the water surface and needed to adjust itself to the under-water environment. A positive point of this plant is that it removes the not wanted nitrogen out of the water. New plants are in my aquarium mainly produced by the plant through adventitious plants. A pity thing is that the plant only makes adventitious plants when the plant is actually to big for my aquarium and takes a lot of light of the other plants. One of these plants in my aquarium, which had been in my aquarium for a long time and had grown very large, started to develop above water leaves. The above water leaves of this plant are firm and spiky as can be seen on the second picture on this page. 

Place and lighting in my aquarium
This plant stood on the right side and right-back of my aquarium. The lighting I used for this plant varied between 0.42 Watt/liter standard TL lighting (2*18 Watt) till 0.63 Watt/liter standard TL lighting (3*18 Watt).
 
Foot-note
The pictures on this page are taken from my own aquarium.

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